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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85cdc8805b6ea19e5709fc49365a932e48c390c66cc6bbd68a4e120739806a3' 
  AND token = 'PQGAEYLxwjx5U5TURKF+0ACgrLsAnl4kTITGpcQH2L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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