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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db9b95943a57666cb033d1dbddb05bbb54c6965df3d9cc4e9b672a75fa876bf' 
  AND token = 'w1bIK3SDCONjYb0XBY0ves6OfEFQBdxqEtpNqebNMsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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