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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944933ebe727d4f3af8625574a9279d5fb25d61c2e94ee6510c898819eddc54e' 
  AND token = 'nT4estPALyiltFzyl7fW4/dal+N2VKNg9LCE+ENqHvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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