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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa10e9093fa8e7fb72d3f176ff84eea53c1f463160c621c6024bcee6a05040f' 
  AND token = 'xGgOXy0jL/fUDlenXF5O0mgmFoDK/S2q2GMh/l6GObA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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