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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4709f9c7b4b07ac9057322a7c62ba4679c1c6dbd8f33f0f4019b44a2f05cdd4c' 
  AND token = 'oJDm6oXz6Em0xrpzMfdJycQ8gxVDvM9YNXRWZ87LJlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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