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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3da152b5c6b1af97a5158cb5e94e7a8dfd09117102e31b20ec1b814ee94046' 
  AND token = 'J0zWkbWMtwI5se7C0x/QzPo9g9P2OPPvwNpcJ+SJL+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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