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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97db42b6d4b1e07a6ba290ad47ec8f3561a5064aeef91cbc02aa3c4a6524cf60' 
  AND token = 'wO3T53nep1BWfAVlBdAfQ+KdujnJ+B6UJw0Yp7kxPpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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