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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a912d59b7ca881eb3d45c7d191ef2784f58ec170760726cc09bd31325fcb63a8' 
  AND token = 'DMKOUbpuAByG9aKb9j9csRT3JDCLFgXsBu80xa5FKDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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