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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226adee8c148e126b59c7f285f3d440ea79f76bfe08e6d65112c05ea919d547d' 
  AND token = 'Zf8Vc9eOvXyv2K5QtgP8FVjLPSICqtOMNO2tNzRMBGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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