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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36be45767c29d1be39affb353c42e7d7fe7a7c1793461f074f5bdfa47319a414' 
  AND token = 'KhXVfOIM4iRr8XMB1EPKeco+vpDKSJ0EBb4GzRJh+Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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