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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f876b042e97d5af548b376d22462b73620d15a45819cdef0ee6d4e99e84db40' 
  AND token = 'sy7jcCbqd26i9+IQQ9qiQX/5c4mwHhgUo5gtVlBAxRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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