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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267bcc31cadad72a59aa47e9219de4f2224c5e9fa313934c44e823a28d42a3e5' 
  AND token = 'TVrZqvBdOwlu2+9LQf18eKlvt4KKeUZq5QRxwi3KTYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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