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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd304063698cc7ab2441238028b953c3d016b4726c32f06d6c9d3d80aba7998bd' 
  AND token = 'Y2n76DrVan3RGkdp5nsK0HU1Fnh4dMzKrty2AkNFLtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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