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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4738c4f4b66d83f99a5abf12716ab999251f3cf82a2396be1b14ee7e5c9d19' 
  AND token = 'CSDrnQ/1CwYeHDlCnBHKAXTiHSdsMZuRFFiVr6ol0qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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