SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19094d54d846c57969fea1615f3fc88b6c05bbfc9d7eea57d7f88276be3f6ee4' 
  AND token = 'IjYufK3peSzWjy0ml8uVPsWBrR/CZRZju8FJ+nDPAwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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