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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c53411847cc8cefb5becdab91239046b62b96b6c854cea0d508923bc698500' 
  AND token = 'iFDfVcxhpLib7qQoT5n4Z0rihpEILNGZUJhxKC7DJ20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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