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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441cea529275a0d77391fff5b770dc1f893e2a542fffa572465ea922ebbc9fed' 
  AND token = 'BOeByTLR5vnclMD9VW36o+wn9HIB8aRkUSxcV+Q3kvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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