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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc386980b26207664eef43a1acb8d83c972bbd19e267615002c49293499c220' 
  AND token = 'mXo8/EaINO309aE5YFbgP6dqbF6TgTpwnGjE7p/mjeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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