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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644c0fa1b9db7f64ea8b39c4de0f5d5373e8002b3e8c02fa1bcade7f38e2a9d7' 
  AND token = '/glIzjVhDc3eu+PJjTQNLJglas1Cl6wE5ciNCBew4+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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