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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311c416ceba8313dd64e54aed0db054ae06f4d6922c873cb44e838efa5187a0e' 
  AND token = 'uihxWM7uaAp3LAwcCIZ/cjuZ0sCJmGL4et9QRgAlQqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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