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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097f9ec63a33f35805152c07104365affee833c5de920f2cc00ce230ac1da41a' 
  AND token = '/zosRaO8fEkMn3JCrrGq1S5l20+sQRg0HGA1XimS6vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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