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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242f6535d553ac8d9e2d554c8994078bc942b177e143c951aa02e33c19f6e775' 
  AND token = 'InkGEp7Qn7AG5ZzcFdnG22ggaYptfrKHmOkP2ulf0/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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