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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbe6cbb92558ea4f37232dd894bf4f7198d7908e22dffb65d513e9c1585ffc' 
  AND token = 'C5BBl0Pw8sJFsSbqnoJEBMJSrt2hrqQGEa8I/NtwKgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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