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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9575f5e5705ec391251a7d48b761ed403a7ba5886ab40e65e4fae6ff625d73b4' 
  AND token = 'QuWZ9wav31HMeFrwceaREzJYfrFsNkw6Jdizl0JYgMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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