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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f6b375b60017d745de60b7259c9bc533584b99ef42d2fe4ef44d1248d9a652' 
  AND token = '8HyNRspifyYqko5TxGZi9Xm2tFniCQCoTsHkPqSThlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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