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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0747e7303e30cf9a0b01d23eb9cfc5aa44b17f837d649964393b8c3145d0711' 
  AND token = 'k33bvRZUfw7MgNr4qGfLmTrj9A5QKjL3Hza2bO0n5as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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