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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b17fff6931e09c54393ae224ad8fefa129c66a4d3d9b792caf331880bdde0d8' 
  AND token = 'SjqT992Y3w5sgOt8qQyfGGXgMfcYel9Ab7fn9S4cwaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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