SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92126d397e6d27ba595fe5e8e4f85fce279dedde461f06213b09939a600e524' 
  AND token = 'OoZzhh9WSuYo/8F78H97zeQ+9jntlEDqaLKmVOyv+4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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