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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f409ee232a16c6bb8f35956b6a458705818853677eecba1cb7aa36eb757effee' 
  AND token = 'nB/ZBEq12RW/NT1VvDpe9An5ho9W8fotXePoCR0fkYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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