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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17700360fd357aa83e33fa4372e9bb36e6ceef07ea7b7a5ab1551a8c930f58d' 
  AND token = 'G6YDTW79tsMgP6ZDQuWLKJqktQHl759A7QEXhI6HtJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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