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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb259df02d4675ca3468cce285c797f671ced8c48f2f64c74f455afe671138c4' 
  AND token = '36ZbXbPSRfkrru87qD2x3QVB3OCizyEXt+h2OJOzFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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