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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79634b64541e33437942a3c3f9da03bfcbfd219f4b4254e9950b42d7dc58216' 
  AND token = 'ZIqxE/vYe7OdFV8k04OdEl9bd8fKyyftuieYapnyJ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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