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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39941fb023c9f28c17e250463c35ebdb8386cfe135ec56eb9a230d12b7ff145f' 
  AND token = 'dBvD6IP+KXeopJxe8EIUfzOvzAwWA3s/50cj6fvJFKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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