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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28cdddb71f1367954b49f76d69af46e6baa03834696a67e8fd51861629787be' 
  AND token = '5a56cKnDcqmBCF7h7KZ3uWrccjol1vI6w8NLkWGu+DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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