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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dd81979176447655798093f7a2718d90fa710659b921e520b04f96cecb9993' 
  AND token = 'IjAqjUMa+6exQqTepVOznIcWMYOC7NPvr3utJ5RKMH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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