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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d97f2250c6a27dbd5ba7318d44a9a55da74763c87bff8fe38f9744b6463c5b' 
  AND token = '8iLaM/QCt/9S6wbQOFJHekGqkjUcZ0oU85U3rcYmr8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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