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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276f1e845b1acd78f56dd623b5b44a4f6be6b8673c61191f25782b138493dfce' 
  AND token = 'n3sOIt8uMdUsN+bTVTj9jNLC81nOEErObdQZW86zS5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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