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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828b3e6acdee030b367fb6a5a946148de47945d51ed74fc28b19535664a7f08d' 
  AND token = '4LmG+EDn9Hr5lqI4f2dJFwL379s8mpRur2Lmr7tnkE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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