SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11dcb273dcdba999ffc2c80411d06c8919715afefc4d0f070aab79bace883aa' 
  AND token = '252/g93+ppvCVu1q+HSJypvDZCLgQdZTtKwMipho/tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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