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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c5ab8b95b901386b8768b3bfe793a67a752980aff72dac0665156a5b6f75ee' 
  AND token = '/W8nDZQl17aeoo41sEaru1fzMGN+Vt7zxBw0FQdNY6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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