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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae56b8c6bb5d6b3712b7c3d792baf97d7aae7ecf51854cf995199009770ded7a' 
  AND token = 'zwbuoODEWuqCvRJoi6kT4Bw4K7gwW/tTc0ilGyEFs5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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