SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad094f519d13b927cd5daf3ac36107fdde4fc94356855e360cdfe20a4dc716b4' 
  AND token = 'rJG87dEOavvgi8ZlMBDQOUji2l+6bpVwqURX+WHErWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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