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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cb64e9e2368e10e5ea4c85dcb24b0ab694991c9091083be50f1bf4a6069c18' 
  AND token = 'xlI7pOIc72+KEgIa7llid0Z7ZDI6ZecyAlyIcO7uVyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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