SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36313135f69729f78621dd6e4ce47524a23f651b5216961b2c4a6655fd457dbc' 
  AND token = '2x+loHKHbIBG0KWjSjUgnyfkwZh4wR3GTj/dg+t6oCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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