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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422255ce89c429339816ae488b7fefc334de4a46b9ad7985a94533ccb0775686' 
  AND token = 'F2KsnU6Ffmj365fkzHdCaaLWMA/r617onsDRK7ZQnlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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