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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d7f44b602ebccfd1d494afcd1d119886f8f58ac0a2647c49872f1de245250c' 
  AND token = 'RqW0xBRqYrkgZu+wx3lNzmdrTdoT4B9VROsTjwKeheQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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