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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ccb7aeb18891652c22be26a41004adfa02ee0898cfa235dbd6ef771059b6aea' 
  AND token = 'WlhgHzGIip4MvwcWUSlJ6ZOp0yl0sst0gyQSONTcJOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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