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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d7b5b9cebb6c71972b06bbf867beb31e9cdd179645f5211ae180333b354d15' 
  AND token = 'JrbqikK+Ktdu1Z97k2luoUeCqvHZu6BIawC83MZRh5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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