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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c013ed0aeb5e2ad0b394a478904de385d7207e401814e8e540b0e5f81e93b9' 
  AND token = 'MwLwxsFkWXiiSBN+Hh/zeBrN/FGEq65ko6azNAHS65I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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