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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a841e3a9b1441e84e98f9594d25f908f3612a18b5a9f31babab35a3cf7ed1a6d' 
  AND token = 'GWxailaJWKpfGoNbFfdR+v8aiaWcEvm0DH0bffOzyLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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