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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011e05bb274e93caa14dca9e86a8002a05bff11634c76a6a5a71d0d45d13625b' 
  AND token = 'c0h6ROXP5M52QIibx8vQflQrycCotwtJ7d1hy/hWXQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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