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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bced6008a7ced12adbabe18aadb704d4e717b6a3d4baabb6432b584ef9d7c2c' 
  AND token = 'fwdqCodmSOn+h/+hWUBLD6psdhxtHmkoea3FtmHygvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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