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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9999e73cd85879b56f83528518222f94bba39a04925cb50fdadcc7950b04c9d5' 
  AND token = 'QaZYidw0c4+8xg+JmsoEhRUJ2TImlXLmYUEY1HvMtG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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