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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92952f0eb4d87ff24617ab935c2b9456118997d0c8f32445f23366c77ecb75fa' 
  AND token = 'XnDTZK9+W2K5TtH4OZfe89r3HcLo94Rf7IBjTSBNq7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}