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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41386bd85daddac0d68910acf56c21841f3614d2218456cb8c43987d19528f0' 
  AND token = 'Arek4h2eMQIjIqgDbOHQF1jFJGvIXfhrIgtzJQp8J4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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