SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b764e97264cf6065ed82438bbb90c241a1964f0345557a877f7ca92040dae5e' 
  AND token = 'MMGqsjK+a54Jx9FL/QUwcMY0YQQJacnmoiZWrvJ9TME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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