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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9429a7f41a8fe403854d86690cc59971c9d69a0ca938bcf2eac2fc0c041c68' 
  AND token = 'gbdIm3Jh+dOfeyF9y7V/h2861sxXqA2f76QW89ZQXKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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