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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88026ad249743697d8d5cc6ccddbcf93f9d9159eaec1220bbf1836854f37be50' 
  AND token = 'rbTFegh6cLChFWeyrgc6ZSIYclBTd9MeX6Y2wE2G2fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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