SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60feb31672877f34ea0184351f5cd030ed0ea80d5184e9f602d8489b533eff84' 
  AND token = 'M62RmVYNmDjOAJGKzfipFT4Ln9ywbjCBF3/JfBZtKww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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