SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fc8b2d6aca732756087a1b633dd602eab50b68bf3befa93d7290b4dec6f39b' 
  AND token = 'Wu2AgmxzMlOsL53qZcTDHoYJK/HIyCTvqMNtVQ8TkLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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