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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95ded1134ba543af58c59a5e16ffb81fefabf10cb45a569e36d70970ec3c6f0' 
  AND token = '71TEp0OXzLyXm+uZfnvEW5UU5EITz0WNbQpzdE5l1wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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