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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d11ff736f08f7b8405334062c5df926e0d48a08435eabe452483bc765928628' 
  AND token = 'QUuoZ7za/Sey61d81BwU4utv0tt4bFQmYVBzrmJEytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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