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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd60a7b7dd3320fa59fb125629af6ad86a2a78d451ba57564b1de01e3b5e561' 
  AND token = '00gTzLf8TdFl7Yg2lvuR88I3R26cyE47t9u9A5PYiU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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